Abstract In the current literature, there is limited information on the influence of operating parameters on spatial mixing quality and how a secondary feed should be introduced into continuous oscillatory baffled reactors (COBR) to achieve good mixing quality. This work explores for the first time the impact of the position of a secondary feed (passive non-reactive tracer) on spatial mixing performance in a COBR using transient laminar CFD simulations. Three theoretical feed positions are studied covering a range of net flow and oscillatory Reynolds numbers ( Re net = 6 - 27 / Re o = 24 - 96 ), the range being chosen to ensure that the flow field remains two-dimensional in all cases. Macromixing is evaluated by analysing the spatial uniformity of the tracer with the areal distribution method developed by Alberini et al. (2014a). Introduction of the secondary stream at the reactor wall or upstream of the edge of the first baffle greatly improves mixing quality due to the recirculation eddies, which assist radial mixing. However, introduction of the secondary feed at the centreline results in high axial dispersion with limited radial mixing. With an adequate introduction position, mixing quality typically increases with an increment in the velocity ratio. Nevertheless, if the net flow is too low, mixing performance decreases because the secondary stream is pushed upstream of the baffles, where it does not benefit from flow recirculation.

中文翻译：

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连续振荡挡板反应器中的混合性能

摘要 在当前的文献中，关于操作参数对空间混合质量的影响以及如何将二次进料引入连续振荡挡板反应器 (COBR) 以实现良好混合质量的信息有限。这项工作首次使用瞬态层流 CFD 模拟探索了二次进料（被动非反应示踪剂）的位置对 COBR 中空间混合性能的影响。研究了三个理论进料位置，涵盖了一系列净流量和振荡雷诺数 (Re net = 6 - 27 / Re o = 24 - 96)，选择该范围以确保流场在所有情况下保持二维。宏观混合是通过使用 Alberini 等人开发的区域分布方法分析示踪剂的空间均匀性来评估的。(2014a)。由于辅助径向混合的再循环涡流，在反应器壁或第一挡板边缘上游引入二次流极大地提高了混合质量。然而，在中心线引入二次进料会导致高度轴向分散和有限的径向混合。如果引入位置足够，混合质量通常会随着速度比的增加而增加。然而，如果净流量太低，混合性能会降低，因为二次流被推到挡板的上游，在那里它不能从流动再循环中受益。在中心线引入二次进料会导致高度轴向分散和有限的径向混合。如果引入位置足够，混合质量通常会随着速度比的增加而增加。然而，如果净流量太低，混合性能会降低，因为二次流被推到挡板的上游，在那里它不能从流动再循环中受益。在中心线引入二次进料会导致高度轴向分散和有限的径向混合。如果引入位置足够，混合质量通常会随着速度比的增加而增加。然而，如果净流量太低，混合性能会降低，因为二次流被推到挡板的上游，在那里它不能从流动再循环中受益。